[docs] Add missing SVG files to devupdate

[sarjona]

Add a reference in devupdate page for Moodle 4.3 to explain the changes done about SVG files in https://tracker.moodle.org/browse/MDL-67271

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[andrewnicols]

Approving this pending the Friday roll.

One query - is there any tooling to make this easier, or any documentation on how to do so?

[sarjona]

Hi @andrewnicols!
Thanks for reviewing this PR! You raised an interesting point so I've added one more sentence to the page to explain the way to update missing SVG in Moodle LMS. I hope it makes sense to you and answers your question (as you'll see, we basically search for the current icon in the FontAwesome database) :-)